I wonder which one is faster...?
I think that would depend on how many batteries you need to charge at once.
Really the only batteries you would want to charge at a higher rate than these chargers offer would be your 18650's.
I believe ( could be wrong on this) the Xtar has 3 banks @ 600 mAh and the Nitecore has 2 @ 750 mAh.
That's not the whole story though.
They both will throttle down at some point not giving a full power charge all the way to the end.
Either way, if you have some 18650's that need really charged fast just drop them in your WP2-II.
I watched the clock on mine a couple of days ago and charged a pair of new Panasonic CGR18650CH's from 3.64V to 4.22V in 2:45 hrs.
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